`Technical Disclosure Bulletin
`Vol. 38 No. 05 May 1995
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`VOLUME 38 - NUMBER 05 - MAY 1995
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`IBM Technical Bulletin is published monthly by International Business Machines Corporation, Thornwood, NY 10594.
`Officers: Louis V. Gerstner, Jr., Chairman of the Board & CEO: Jerome B. York, Senior Vice President & CFO; Donato A. Evangelista,
`Senior Vice President & General Counsel; John E. Hickey, Vice President, Secretary & Assistant General Counsel; Vynetta W. Ross, Editor.
`Inquiries should be directed to Intellectual Property Law & Licensing Services, International Business Machines Corporation,
`Thornwood, NY 10594,
`
`©Copyright International Business Machines Corporation 1995. Printed in the U.S.A. The publication of these technical disclosures does
`not constitute a grant of any licensing underpatent.
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`NOTICES
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`This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein:
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`© IBM Corp.
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`HUAWEI EX. 1009 - 1/2
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`HUAWEI EX. 1009 - 1/2
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`2=2 Technical Disclosure Bulletin
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`Vol. 38 No. 05 May 1995
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`Communication Method between Devices through FDDInterface
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`pseudo FDD device
`
`
`
`Address
`Generator
`+-—-+—--—--~~~+
`toneen=4+———————.. +
`FDD
`aeinem
`
`
`<- [+] ------- Host
`==>} Controller
`Interface +-----~---~---F
`
`Fora +~--—+
`
` Converter
`
`
`+-——
`
`$o-+
`tone
`Format Signal
`Generator
`tone+
`
`
`
`
`
`—_—+
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`
`
`
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`tament
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`’
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`Disclosed is a method for communicating between devices through Floppy Disk Drive (FDD)
`. Interface which can be implementedvia serial data lines, such as Write Data and Read Data. The
`FDD Host Controller compares a requested address and a address from the FDDin Read/Write
`operation. Only when the addresses are matched, the FDD Host Controller reads data on the
`data frame preceded by the address or writes data there.
`In the communication method through
`the FDD Interface, the sector data from the FDD,such as ID and DATA field information, are
`handled as packet data; ID field as packet header and datafield as packet data. The packet header
`has the packet attributes to indicate data type in the packet data. The Figure shows the block
`diagram of the subject method.
`* Address Generator generates the address information compatible with FDD ID information.
`It indicates packet attribute; Command Packet, Status Packet, Device Information Packet and
`Data Packet.
`
`* MFM endec decodes and encodes MFM data on Read/Write data line.
`* Format Signal Generator generates FDD compatible format pattern such as Synch-pattem.
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`© IBM Corp. 1995
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`HUAWEI EX. 1009 - 2/2
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`HUAWEI EX. 1009 - 2/2
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